CREVCORR Résumé de rapport

Report on calibration of the participating laboratories

The report describes the results of an intercomparison test of the laboratories participating in the Crevcorr-project. The Critical Crevice Temperature (CCT) of the 2205 duplex and the 254SMO super austenitic stainless steel was determined by several laboratories according to a well defined procedure. Rectungal coupons were equipped with multi-crevice-washers and exposed in a ferric chloride solution at three different temperatures, after which the resulting attack was noted. Amongst the possible criteria, it would appear that a maximum depth of attack equalling or exceeding 25 µm allows a relatively accurate determination of CCT, even though significant scatter exists between individual depth results from different laboratories and in some cases between duplicate tests.